Communications: electrical – Digital comparator systems
Patent
1975-12-08
1977-10-11
Hecker, Stuart N.
Communications: electrical
Digital comparator systems
346 77E, 346151, G11C 1146, G01D 1502
Patent
active
040538729
ABSTRACT:
An apparatus for and a method of recording or writing optical data into a thermoplastic layer is disclosed. The apparatus includes a layer of photoconductive material that is photoconductively responsive to a data containing light beam having a wave length below the infrared (IR) range and a layer of thermoplastic material that is thermoplastically responsive to a light beam having a wave length within the IR range. In practicing the method of the present invention, the electrically charged apparatus is exposed to a data-bearing light beam having a wave length below the IR range for selectively exposing, i.e., electrically charging, the photoconductive layer. Next, the apparatus is exposed to a light beam having a wave length within the IR range for heating the thermoplastic film and thermally permitting the selective electric charge in the photoconductive layer to distort the surface of the thermoplastic layer, and, accordingly, writing into the thermoplastic layer the optical data that was contained within the data-bearing light beam.
REFERENCES:
patent: 3519422 (1970-05-01), Gaynor et al.
Butter et al., Thermoplastic Helegraphic Recording of Binary Patterns in PLZT Line Composer, IEEE Transactions on Computers, vol. C-24, No. 4, Apr. 1975, pp. 402-406.
Chang et al., High-Resolution Thermoplastic Recording, IBM Technical Disclosure Bulletin, vol. 9, No. 12, May 1967, p. 1821.
Honebrink Roger Wayne
Johnson Leslie Harold
Lo David Shih-Fang
Grace Kenneth T.
Hecker Stuart N.
Sperry Rand Corporation
Truex Marshall M.
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